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Kenny is three times older than Bob. In P years he will be

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Manager
Joined: 31 Dec 2003
Posts: 214
Location: US
Kenny is three times older than Bob. In P years he will be [#permalink]

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01 Sep 2004, 09:28
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15. Kenny is three times older than Bob. In P years he will be twice older than Bob will be Q years later. Which of the following represents Kennyâ€™s age comparing to Bobâ€™s? (If X = Kennyâ€™s age)

(a) X + P = 6X(P+Q).
(b) 2(X+P) = 3X + Q.
(c) (X+P)/2 = X/3 + P + Q.
(d) 3(X+P+Q) = 2X.
(e) 3X = 2(P + Q).
Director
Joined: 20 Jul 2004
Posts: 592

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01 Sep 2004, 10:14
C?

X = 3B

X + P = 2(B + P + Q)
=> X = 3(P + 2Q)

C. (X+P)/2
=[3(P+2Q)+P]/2
=[4P+6Q]/2
=2P+3Q

= X/3 + P + Q.
= P+2Q + P + Q
= 2P+3Q

Actually I found C. this by substituiting number, X = 24, B = 8, P = 6 and Q = 1. Above explanation was just from proof point of view.
Senior Manager
Joined: 22 Jun 2004
Posts: 392
Location: Bangalore, India
Re: PS - Kenny and Bob [#permalink]

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10 Sep 2004, 12:17
Hi Hardworker,

I am unable to understand the equation viz., X + P = 2(B + P + Q).
the stem says 'In P years he will be twice older than Bob will be Q years later.', then the equation should be X + P = 2(B + Q).

How could you get from the stem that P years is after B+Q years?

Could you explain me? It may be problem with my English. However, do explain me. Has anybody else got the same equation?

anuramm wrote:
15. Kenny is three times older than Bob. In P years he will be twice older than Bob will be Q years later. Which of the following represents Kennyâ€™s age comparing to Bobâ€™s? (If X = Kennyâ€™s age)

(a) X + P = 6X(P+Q).
(b) 2(X+P) = 3X + Q.
(c) (X+P)/2 = X/3 + P + Q.
(d) 3(X+P+Q) = 2X.
(e) 3X = 2(P + Q).

_________________

Awaiting response,

Thnx & Rgds,
Chandra

Director
Joined: 08 Jul 2004
Posts: 596

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10 Sep 2004, 13:46
Chandra I am interpreting the equation like you, so no where yet!
S
Director
Joined: 20 Jul 2004
Posts: 592
Re: PS - Kenny and Bob [#permalink]

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11 Sep 2004, 10:35
mallelac wrote:
Hi Hardworker,

I am unable to understand the equation viz., X + P = 2(B + P + Q).
the stem says 'In P years he will be twice older than Bob will be Q years later.', then the equation should be X + P = 2(B + Q).

How could you get from the stem that P years is after B+Q years?

Could you explain me? It may be problem with my English. However, do explain me. Has anybody else got the same equation?

That is because in the sentence "In P years he will be twice older than Bob will be Q years later"
"In P years" is common to both "Kenny will be twice older" and "Bob will be Q years later"
Senior Manager
Joined: 22 Jun 2004
Posts: 392
Location: Bangalore, India
Re: PS - Kenny and Bob [#permalink]

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12 Sep 2004, 22:51
Thanks for the explanation. However, I am not convinced fullly.

This may be best bet for 'setence correction' stuff.

hardworker_indian wrote:
mallelac wrote:
Hi Hardworker,

I am unable to understand the equation viz., X + P = 2(B + P + Q).
the stem says 'In P years he will be twice older than Bob will be Q years later.', then the equation should be X + P = 2(B + Q).

How could you get from the stem that P years is after B+Q years?

Could you explain me? It may be problem with my English. However, do explain me. Has anybody else got the same equation?

That is because in the sentence "In P years he will be twice older than Bob will be Q years later"
"In P years" is common to both "Kenny will be twice older" and "Bob will be Q years later"

_________________

Awaiting response,

Thnx & Rgds,
Chandra

Re: PS - Kenny and Bob   [#permalink] 12 Sep 2004, 22:51
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